Steam-boiler.



PA'EEBT'IFIZD DEC. 15:, 1908.

R. SGHULZ. STEAM BOILER.

APPLICATION FILED NOV. 10, 1 902.

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Patented December 15, 1903.

I RICHARD SCHULZ, OF BERLIN, GERMANY.

' STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 746,882, dated December 15, 1903. Application filed NovemberlO. 1902. Serial No. 130,761. (No model.)

To all whom it may concern: I Be it known that I, RICHARD SOHULZ, a subject of the German Emperor, residing at Berlin, in the Empire of Germany, have invented tion.

, My invention relates to steam-boilers, and has for its object the provision of a separate chamber independent of the combustionchamber for completely burning the products of combustion generated in said combustionchamber after they have passed through one or more sets of water-tubes one or more times and consists of a crossover or chamber built of fire-brick or other suitable fireproof material across the end of the combustion-chamher and preferably, though not necessarily,

, provided with staggered partition-walls acting as baffie-plates to cause the gases to deposit the fine ash carried by them and at the same time means may be provided to admit a fresh furnace-gases directly from the combustion-chamber in front of this auxiliary combustion-chamber and also fresh air to supply the necessary oxygen for combustion.

This air may be preheated or not, as desired.-

Referring to the drawings, in which like parts are similarly designated, Figure 1 is a diagram showing the course of gases through a boiler shown partly in vertical and horizontal section in Figs. 1 and 2 and in vertical longitudinal section in Fig. 3. Fig. 4 is a cross-section of a similar boiler having straight water-tubes; Fig. 5, a crosssection in which there are no water-drums. Fig. 5 shows the structure of the Water-tubes in Fig. 5. Fig. b is a diagram showing the course of furnace-gases through a boiler shown in vertical and horizontal cross-section in Figs. 6 and 7. Fig. 8 is a diagram showing the course of furnace-gases in a boiler shown in vertical and horizontal section in Figs. 8 and 9. Fig. 10 is adiagram illustrating the course of furnace-gases in a boiler shown partly in vertical section in Figs. 10 and 11. Fig. 12 is a similar diagram showing the direction of furnace-gases in the boiler shown in section in Fig. 12. Fig. 13 is a diagram showing the direction of furnace-gases in the boiler shown in vertical and horizontal cross-section in Figs. 13 and 14 and in vertical longitudinal section in Fig. 15. Fig. 16 is a diagram of the direction of furnace-gases in the boiler such as shown in vertical and horizontal crosssection in Figs. 16 and 17 and partly in vertical longitudinal section in Fig. 18. Fig. 19 is a diagram of the direction of furnace-gases in the boiler shown in vertical and horizontal cross-section in Figs. 19 and 20 and in vertical longitudinal section in Fig. 21. Fig. 22 is a diagram of the. direction of furnacegases in the boilers shown in cross-section in Figsf22, 23, and 24. Figs. 25 and 26 show the structure of the-so-called double boiler.

Fig. 27 is a cross-section of the arrangement of the tubes in Fig. 26. Figs. 28, 29, 30, and 31 show a modification in which the gases take a tortuous path through the several sets of tubes.

In all of the figures the arrangementissuch I that there is a continuous passage of gases from the main combustion-chamber around all of the tubes adjacent the combustionchamber on one side thereof to the auxiliary combustion-chamber located at the back of the main combustion-chamber to a set or sets of tubes adjacent to and on the other side of the main combustion-chamber. In the auxiliary combustion-chamber gases after giving up some of their heat to one or more sets of water-tubes are burned at a lower tempera ture than in the main combustion-chamber, and from it the gases pass either one or a plurality of times along the side of the main combustion-chamber to heat one or more sets of tubes,whereby the unburned products ofcombustion are complet ely burned before passing the latter set or sets of tubes, and considerable of the ash carried by the gases is deposited in the auxiliary combustion-chamber.

It will be observed that the center of the auxiliary combustionchamber is narrowed and preferably, though not necessarily, provided at this point with walls or baffieplates extending into the chamber to cause the detheir lower ends, the tube f ending some-- posit of the ash, and at such points a supply of fresh furnace-gases is admitted, together with air. Generally in all the structures shown the gases take a horizontal tortuous course from the main combustion-chamber and through the auxiliary combustion-chamber so that as much of the heat in said gases as possible will be imparted to the watertubes on either side of the combustion-chamber.

Referring more particularly to Figs. 1, 2, and 3, which show a boiler having a single main combustion-chamber a, a single steamdrum Z), and two lateral lower water-drums c. The gases from the main combustionchamber a pass through the lateral set of tubes 1, then through the auxiliary combustion-chamberw, and then through the lateral set of tubes 2. At the center of the auxiliary combustion-chamber w are walls to or partial partitions that narrow the chamber at this point and cause the furnace-gases to take either an up and down or a back and forth direction, thereby acting as baffle-plates, and between these walls are passages 00 leading from the main combustion-chamber to supply fresh furnacc-gases, and within the wall between the main and the auxiliary combustion-chambers are passages m for the ad mission of air through said wall. The rear wall of the auxiliary combustion-chamber is also provided with small passages 03 for similar purposes. The air can be admitted to the auxiliarycombustion-chamber in anydesired manner, as by forming long passages in the walls of the auxiliary combustion-chamber or other suitable places in order to preheat the air, such preheating passages being shown at In order to maintain a closed passage for the fire-gases among the water-tubes, the latter are arranged in a Well-known way to form tubular walls around the main combustion-chamber, with open passages at those points where the gases must enter and leave each set of tubes. 1

In Fig. 4, which is in all respects similar to Fig. 1, the water-tubes are perfectly straight, and in Fig. 5, which is also similar to Fig. 1,

- these water-tubes are straight. When lower drums are dispensed with, the tubes are formed double, as shown in Fig. 5, of an outer tube eand an inner tube f, closed at what above the bottom of the tube e and fitting into a spider g or other suitable device, there being no water-drums.

Referring to Figs. 6", 6, and 7, which show a single main combustion-chamber a, having at one side two sets of tubes 1 and 1, forming a continuous passage leading to the auxiliary combustion-chamber w, from which the furnace-gases go to the set of tubes 2 on the other side of the main combustion-chamber.

Figs. 8, 8, and 9 show a single combustionchamber a, in which the furnace-gases pass from the rear of the main combustion-chamher through two sets of tubes 1 and 1 on one side of the main combustion-chamber to the auxiliary combustion-chamber 0a, and then through two sets of tubes 2 and 2 on the other side of the main combustion-chamber.

Referring to Figs. 10, 10, and 11, these show a boiler having a steam-drum b, lateral water-drums c c, and intermediate waterdrums c c, and three main combustionchambers a, a, and a in which the gases pass from the main combustion-chambers forward, then back through the set of tubes 1 on each side of the central main combustion-chamber a to each of the auxiliary combustion-chambers 0c. The gases from the combustion-chambers a and a each pass forward through a similar set of tubes 1, parallel to those 1, and unite in the auxiliary combustion-cham ber 00 with those from the chamber a, when they pass forward through single sets of tubes 2, whereby those sets of tubes 1 and l uniting the steam-drum b with the intermediate water-drum c are acted upon on both sides by gases from the main combustion-chambers, while those 2 are acted on by gases from theanxiliarycombustion-chamber 00.

Referring to Figs. 12 and 12, which show a similar structure, there being two steamdrums b and I), connected by steam-tube 2', and a water-tube h, each steam-drum being connected to two water-drums c and a, respectively, and all the water-drums connect ed by a circulating-pipe k. Gases will pass from the main combustion-chambers a, a, and a forward and through the sets of tubes 1 and 1, between adjacent main combustion chambers, and be united in the auxiliary combustion -chambers x to form two currents, each current then passing twice along a lateral main combustion-chamber a or a through sets of tubes 2 and 2 Figs. 13, 13, 14:, and 15 show a boiler having a single steam-drum b and three waterdrums c o o and two main combustion-chambers a and ct. From each combustion-chamber the gases pass forward and then through tubes 1 to an auxiliary combustion-chamber w,behind each main combustion-chamber,and then through the tubes 2.

Figs. 16*, 16, 17, and'l8 show a single upper steam-drum 1), connected to three lower drums c c c and two combustion-chambersa and a, from both of whicn the furnace-gases first pass from the rear through a set of tubes 1, then through a set of tubes 1 through the auxiliary combustion-chamber0c, through a set of tubes 2 to a common fine between the two combustion chambers, from which they pass into the stack.

Figs. 19 19, 20, and 21 show a structure similar to Fig. 16, in which there is no central passage in which the gases are united between the main combustion-chambers a and a just before they reach the stack. The gases from each of the forward ends of the main combustion-chambers pass through the IIO set of tubes 1 to the auxiliary combustionchamber w, thence through a set of tubes 2 and 2, the sets of tubes 1 being in close proximity without aflue or passage between them.

In Figs. 22 and 22 there are two steamdrums b and I), connected to water-drums o c and c, the gases from the main combustion-chambers a and a passing along each side of the main combustion-chamber from the rear of said chambers, first through a set of tubes 1 and 1 to the auxiliary combustion-chamber a}, then through a set of tubes 2 and 2 Figs. 23 and 24: show a single steam-drum b and combustion-chambers a and a, the former figure having lower water-drums c oand c, the latter having no water-drums. In each of these the gases pass first through a set of tubes 1 to the auxiliary combustion chamber and then through the two sets of tubes 2 and 2.

In Figs. 25 and 26 there is a single steamdrum 1) and six combustion-chambers a, a, a a a and a s From the foreends of these chambersthe gases pass through adjacent sets of tubes 1, separated from one another by a wall of water-tubes w, and between adjacent combustion-chambers into the auxiliary combustion chamber a; and then through lateral sets of tubes 2 at the sides of the outer combustion-chambers a, a a and a into the stack.

Fig. 27 shows the arrangement of the central set of water-tubes 1 and a dividing-wallw to divide the set of tubes between the central and the lateral main combustion-chambers.

Figs. 28, 29, 30, and 31 show arrangements in which the gases have an up and down passage in a general longitudinal direction through the sets of tubes, and this is accomplished by inserting partitions s and t in said set of tubes.

Having now described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a steam-boiler, the combination with the steam-drum and two or more lower waterdrums, water-tubes arranged in sets connecting the water-drums with the steam-drum, a main com bustion-chamber between each two water-drums, means to direct furnace-gases around said tubes, an auxiliary combustion chamber separate from and at one end of the main combustion-chamber to form aconducting-passage for furnace-gases from one set of tubes to another, and means to supply a promoter of combustion in said chamber, substantially as described.

2. In a steam-boiler, the combination with the steam-drum and two or more lateral lower water-drums, water-tubes arranged in sets and connecting the waterdrums with the steam-drum, a main combustion-chamber between each two water-drums, means to direct furnace-gases around the tubes and an auxi tion-chamber, said auxiliary combustionchamber connecting the passages through sets of tubes to form a single continuous passage for furnace-gases, substantially as described.

3. Ina steam-boiler, the combination with the steam-d rum and two or more lateral lower water-drums, water-tubes arranged in sets and connecting the waterdrums with the steam-drum, a main combustion-chamber between each two water-drums, means to direct f urnace-gases around the tubes, an auxiliary combustion chamber independent of the main combustion-chamber and having inlets for a promoter of combustion connecting the passages of two sets of tubes, substantially as described.

4. The combination with one or more steamdrums, two or more water-drums and watertubes connecting the steam-drums with the water-drums and arranged in sets, and means to direct furnace-gases through sets of tubes; of an auxiliary combustion-chamber behind the main combustion-chamber,staggered partitions therein and openings in the wall between the two combustion-chambers and between partitions to supply furnace-gases, and means to admit air to the auxiliary chamber, said auxiliary chamber intermediate sets of tubeasubstantially as described.

5. The combination with one or more steamdrums, two'or more water-drums and watertubes connecting the steam and water drums arranged in sets, and a main combustionchamber separating the water-drums; of an auxiliary combustion-chamber independent of the main one or ones and separated therefrom by a wall, having one or more-openings to admit furnace-gases to the auxiliary combustion-chamber, said wallalso provided with air-inlet passages to preheat air supplied to the auxiliary combustion-chamber, substantially as described.

6. In asteam-boiler, the combination with the steam-drum and water-tubes arranged in sets having conducting-passages formed within the sets for the to rnace-gases,of a fire-brick, auxiliary combustion-chamber interposed between the sets of tubes to form a continuous passage for furnace-gases from one set of tubes to another, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

RICHARD SCHULZ.

IIO 

